The authors claim that canonical quantization of Einstein-Hilbert plus Gauss-Bonnet squared gravity requires a cosmological constant to resolve contradictions, but the contradictions appear to follow from questionable assumptions rather than from the theory itself.
Parker, Quantized fields and particle creation in expa nding universes, II
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The role of cosmological constant in f(R, G) gravity
The authors claim that canonical quantization of Einstein-Hilbert plus Gauss-Bonnet squared gravity requires a cosmological constant to resolve contradictions, but the contradictions appear to follow from questionable assumptions rather than from the theory itself.